Day 1 covers the first half of Chapter 1, Introductory

Having last month considered the deities and other beings present in the congregation, we witness the reaction to the World-Honored One expounding the sūtra of the Great Vehicle called the “Innumerable Teachings.

King Ajatasatru, who was the son of Vaidehi, was also present with his hundreds of thousands of attendants. They each worshipped the feet of the Buddha, retired, and sat to one side.

Thereupon the four kinds of devotees, who were surrounding the World-Honored One, made offerings to him, respected him, honored him, and praised him. The World-Honored One expounded a sūtra of the Great Vehicle called the “Innumerable Teachings, the Dharma for Bodhisattvas, the Dharma Upheld by the Buddhas.” Having expounded this sūtra, the Buddha sat cross-legged [facing the east], and entered into the samadhi for the purport of the innumerable teachings. His body and mind became motionless.

Thereupon the gods rained mandārava-flowers, mahā-mandārava-flowers, mañjūṣaka-flowers, and mahā-mañjūṣaka-flowers upon the Buddha and the great multitude. The world of the Buddha quaked in the six ways. The great multitude of the congregation, which included bhikṣus, bhikṣunīs, upāsakās, upāsikās, gods, dragons, yakṣas, gandharvas, asuras, garuḍas, kiṃnaras, mahoragas, men, nonhuman beings, the kings of small countries, and the wheel-turning-holy-kings, were astonished. They rejoiced, joined their hands together [towards the Buddha], and looked up at him with one mind.

See The Story of Devadatta and Ajātaśatru